Introduction: Gabharu River Erosion – A Silent Crisis in Assam

The Gabharu River, a north-bank tributary of the Brahmaputra, is currently causing severe riverbank erosion in Sonitpur district, Assam, particularly affecting areas like Saraka Baligaon and Kahikuchi. Since mid-2022, the problem has worsened, leading to the destruction of fertile cropland, severely impacting the livelihoods of small and marginal farmers.

Geography of the Gabharu River

• Origin: Kalafangapo Hills, West Kameng district, Arunachal Pradesh

• Length: ~52 km

• Direction: North-Northwest to South-Southeast

• States Covered: Arunachal Pradesh and Assam

• Confluence: Joins the Brahmaputra River at Gadharu Mukh, Chapari Gaon in Sonitpur

• River Basin Area: ~330 sq. km

• River Order: Sixth-order basin

Tributaries

• Right-bank tributaries:

  • Sonairupai River

  • Gelgeli River

• Left-bank tributary:

  • Mora Depota River

Cause of Erosion: Human Intervention

• In mid-2022, the Water Resources Department allegedly diverted the Gabharu’s flow toward the eastern bank to protect the western dyke near Kahikuchi.

• This diversion altered the river’s natural course, increasing pressure on vulnerable riverbanks like Saraka Baligaon.

• The result: severe erosion, land loss, and farmer displacement.

Impact on Farmers and Rural Economy

• Loss of fertile cropland = Reduced agricultural output

• Threat to food security in local areas

• Marginal and small-scale farmers face rising economic insecurity

• No effective anti-erosion measures implemented despite repeated appeals to local authorities and the Water Resources Department

Environmental & Socio-Economic Relevance

• Riverbank erosion is a major environmental hazard in Assam, especially along Brahmaputra and its tributaries.

• Affects disaster management, agricultural planning, and socio-economic policies.

• Important for understanding climate vulnerability and river governance in India

 Statement-Based MCQs for APSC/UPSC Practice

Q1.Consider the following statements about the Gabharu River:

1. It is a south-bank tributary of the Brahmaputra River.

2. The Gabharu originates in the Kalafangapo Hills of Arunachal Pradesh.

3. It joins the Brahmaputra River in Jorhat district, Assam.

Which of the statements given above is/are correct?
A) 1 and 2 only
B) 2 only
C) 2 and 3 only
D) 1, 2 and 3

Answer: B) 2 only